Hydropropeller



H. COAN DA HYDROPROPELLER Jan. I8, 1955 2 Sheets-Sheet l Filed Feb, 2. 1948 Rotor lm eller Shag. p

Suction Pump Slo Hed wave r Ejecfng Wuer Level.

INVENTOR,

COAN @A y HENRi,

Jan. 18, 1955 H. coANDA 2,699,644

HYDROPROPELLER Filed Feb, 2. 1948 2 Sheets-Sheet 2 M Y INVENTOR, I8 6 -l-IENRl COANDA,

,Q ATTORNEYS.

United States Patent O YDROPROPELLER Henri 'Coanda, Paris, France Application February 2, 1948, Serial No. 5,735 In France November 21, 1946 Section 1, Public -Law 690, August 8, 19416 Patent expires November 251, 1966 4 Claims. (Cl. 60-35.5)

The present invention relates to a device working in such a manner that it forms a means for propulsion of a boat in or on the water and mainly comprising:

(a) Water intake means,

(b) Means for raising the pressure acting upon the water taken in by said means,

(c) Means for ejecting this water under pressure, said means comprising at least a slot-shaped tuyre one lip of the mouth of which is extended while continuously diverging from the direction of the axis of the slot s that the at water jet issuing from said slot is turned down towards the said extended lip. In other words, the wall of the unit posterior to the slot-shaped tuyeres forms a lip and in elfect becomes an extension of the lip as it diverges from the direction of the axis of the slot.

The said unit can either form an integral part of the boat to be propelled, the slot or slots being distributed at chosen points of the hull, or be provided in part or in totality outside the boat, for instance in chambered bodies fast with the boat or in any other similar manner.

The boat may, for instance, be provided with one or more self-governing propeller bodies pulling or propelling the boat.

The various means can be used for applying a pressure to the water taken by the members mentioned under (a) before it is ejected through the tuyre or tuyres mentioned under (c).

The slots forming the tnyres may be formed in the hull of the boat in the manner of iish gills and the water intake members may be located either quite in the front or in any other chosen place.

In case the propelling unit is located in ailerons the latter may be mounted so that beside the water which is carried away in the manner of an induced current by the water leaving the tuyre and playing the part of the inducing current, the latter also carries along with it a certain quantity of air which flows along the hull of the boat in order to reduce its rubbing action.

The invention will now be described more particularly with reference to the appended drawings which show diagrammatically dilerent embodiments thereof. In said drawings:

Figs. l and 2 are fragmentary longitudinal sectional views showing two variants of the adaptation of the hydropropulsive unit on the same front part of the body to be propelled.

Figs. 3 and 4 show in a side elevational and in a plan view, respectively, the application of the invention in a suction and force system including laterally spaced water ejecting bodies placed along the sides of the hull ofthe boat;

Fig. 5 is a front end elevation of the structure of Figs. 3 and 4;

Fig. 6 is a view partly in elevation and partly in section of the propulsion unit of Figs. 3, 4 and 5 on an enlarged scale; and

Fig. 7 is a detail horizontal view taken on the line 7--7 of Fig. 6, and additionally including a fragment of the hull of the boat.

In the example shown in Fig. l a boat body 1 is immersed in a mass of water at 2 and draws in water through an opening 3, said water entering a vane compressor 5 through a convergent-divergent inlet chamber or portion 4, whereafter it is forced into a chamber 6 and ejected through slots 7, the direction of which makes an angle 8 with the wall of the body 1 which forms a Patented Jan. 18, 1955 ICC 2 posterior extension of lthe lip 9 thus carrying o a quantity 0f Waiter 10 taken IOJt "f `nthe Uia's f 'Water 2. The vane compressor 5 is 4-drivenjthrough the shaft 11 which transmits the power supplied by any suitable Source.

In Fig. 2, a boat -bod-y 1' immersed in a liquid r'nass at 2 draws in through a suction compressor 3 a `cpllantity of water which lis delivered through lthe pipe 4 into a chamber 5 provided with a circular slot 6 and which carries along through the convergent-divergent `portion or chamber 7 a mass of water 9', `aportion of 'which passes through the conduit 8 and feeds the compressor 3 while the remainder passes through chamber 11' which it leaves through a circular slot 12', the direction of which makes a predetermined angle with the extended lip 14 of the mouth of said slot.

Referring now to the form of the invention shown in Figs. 3 to 7, 15 designates the hull of a nautical vessel which is equipped with a suction and force system or apparatus. The latter includes a longitudinally disposed body 16 carried by the hull and disposed below the water level of said hull as shown and it has an inner wall or conduit 17, the latter being formed into a convergent-divergent inlet portion 18 centrally located and open at the bow of the vessel. A suction pump P is carried by the hull and communicates with the chamber 19 of body 16 through conduit branches 20 and 2l, the former being an extension of conduit 17.

Another conduit or branch 22 communicates with the pump P, extending centrally forwardly and downwardly therefrom and to the chamber 19. Said convergentdivergent inlet portion adjacent the outlet of conduit 22 has an annular slot S for injection of water from conduit 22 into chamber 19 and then into said inlet portion 18.

Water ejection bodies 23 in laterally spaced apart relation are located one on each side of said hull and they provide chambers which receive water from the branch conduits 20 and 21 through oppositely directed pipes 24 and 25. From the chambers of bodies 23, the water is ejected through slots 26 located rearwardly of nilullar slot S and in walls of the bodies 15 facing said In the operation of this form of Figs. 3 to 7, pump P draws in water through the convergent-divergent inlet portion 18 which partly circulates in conduits 20 and 21, and most of such water passes through conduits 24 and 25 into the chambers of bodies 23 and is ejected through slots 26 to propel the vessel. The conduit 12 at the same time directs a portion of the water passing through the pump into chamber 19 and ejects it through the slot S back into portion 18. It is to be noted that the location of slots 26 causes the water ejected therethrough to carry with it air which thus passes between the hull and the water.

What I claim is:

1. In a nautical vessel, a suction pump, a body below the water level of the hull thereof, said body having a convergent-divergent inlet portion, said portion having an annular slot therein, conduit means between the pump and body to eject through said slot a portion of the water which passes through said convergent-divergent inlet portion, laterally spaced ejection bodies having chambers in receiving relation to water passing through said convergent-divergent inlet portion, and said ejection bodies having slots spaced rearwardly from the annular slot through which water from said chambers is ejected.

2. In a nautical vessel, a suction pump, a body below the water level of the hull thereof, said. body having a convergent-divergent inlet portion, said portion having an annular slot therein, conduit means between the pump and body to eject through the said slot a portion of the water which passes through said convergent-divergent portion, means providing an injection chamber in receiving relation to water passing through the convergentdivergent inlet portion, and said chamber having slot means spaced rearwardly from the annular slot through which water from said chamber is ejected to propel the vessel under the action of said pump.

3. A nautical vessel according to claim 1 wherein the slots of said chambers face said hull.

4. A nautical vessel according to claim 2 wherein an References Cited in the le of this patent UNITED STATES PATENTS Stucky June 28, 1881 Walker Aug. 9, 1892 Vidal Apr. 29, 1902 Diehl f Aug. 10, 1909 Dean Jan. 5, 1915 Koleroft` May 13, 1924 Anderson July 21, 1925 4 Gay Sept. 16, 1930 Bauer 2 Dec. 29, 1931 Campini Dec. 17, 1935 Coanda Sept. 1, 1936 Thompson June 8, 1943 Brase Aug. 22, 1944 McCollum Dec. 17, 1946 Zwicky Feb. 15, 1949 FOREIGN PATENTS France Sept. 10, 1913 France June 25, 1934 France Aug. l, 1939 (Addition to No. 779,655) 

